task_log_buffer_esp32.cpp

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#ifdef USE_ESP32
 
#include "task_log_buffer_esp32.h"
#include "esphome/core/log.h"
 
#ifdef USE_ESPHOME_TASK_LOG_BUFFER
 
namespace esphome::logger {
 
TaskLogBuffer::TaskLogBuffer() {
  // Create a static ring buffer with RINGBUF_TYPE_NOSPLIT for message integrity
  // Storage is a member array (embedded in Logger), no heap allocation needed
  xRingbufferCreateStatic(sizeof(this->storage_), RINGBUF_TYPE_NOSPLIT, this->storage_, &this->structure_);
}
 
bool TaskLogBuffer::borrow_message_main_loop(LogMessage *&message, uint16_t &text_length) {
  if (this->current_token_) {
    return false;
  }
 
  size_t item_size = 0;
  void *received_item = xRingbufferReceive(this->handle_(), &item_size, 0);
  if (received_item == nullptr) {
    return false;
  }
 
  LogMessage *msg = static_cast<LogMessage *>(received_item);
  message = msg;
  text_length = msg->text_length;
  this->current_token_ = received_item;
 
  return true;
}
 
void TaskLogBuffer::release_message_main_loop() {
  if (this->current_token_ == nullptr) {
    return;
  }
  vRingbufferReturnItem(this->handle_(), this->current_token_);
  this->current_token_ = nullptr;
  // Update counter to mark all messages as processed
  last_processed_counter_ = message_counter_.load(std::memory_order_relaxed);
}
 
bool TaskLogBuffer::send_message_thread_safe(uint8_t level, const char *tag, uint16_t line, const char *thread_name,
                                             const char *format, va_list args) {
  // First, calculate the exact length needed using a null buffer (no actual writing)
  va_list args_copy;
  va_copy(args_copy, args);
  int ret = vsnprintf(nullptr, 0, format, args_copy);
  va_end(args_copy);
 
  if (ret <= 0) {
    return false;  // Formatting error or empty message
  }
 
  // Calculate actual text length (capped to maximum size)
  static constexpr size_t MAX_TEXT_SIZE = 255;
  size_t text_length = (static_cast<size_t>(ret) > MAX_TEXT_SIZE) ? MAX_TEXT_SIZE : ret;
 
  // Calculate total size needed (header + text length + null terminator)
  size_t total_size = sizeof(LogMessage) + text_length + 1;
 
  // Acquire memory directly from the ring buffer
  void *acquired_memory = nullptr;
  BaseType_t result = xRingbufferSendAcquire(this->handle_(), &acquired_memory, total_size, 0);
 
  if (result != pdTRUE || acquired_memory == nullptr) {
    return false;  // Failed to acquire memory
  }
 
  // Set up the message header in the acquired memory
  LogMessage *msg = static_cast<LogMessage *>(acquired_memory);
  msg->level = level;
  msg->tag = tag;
  msg->line = line;
 
  // Store the thread name now instead of waiting until main loop processing
  // This avoids crashes if the task completes or is deleted between when this message
  // is enqueued and when it's processed by the main loop
  if (thread_name != nullptr) {
    strncpy(msg->thread_name, thread_name, sizeof(msg->thread_name) - 1);
    msg->thread_name[sizeof(msg->thread_name) - 1] = '\0';  // Ensure null termination
  } else {
    msg->thread_name[0] = '\0';  // Empty string if no thread name
  }
 
  // Format the message text directly into the acquired memory
  // We add 1 to text_length to ensure space for null terminator during formatting
  char *text_area = msg->text_data();
  ret = vsnprintf(text_area, text_length + 1, format, args);
 
  // Handle unexpected formatting error
  if (ret <= 0) {
    vRingbufferReturnItem(this->handle_(), acquired_memory);
    return false;
  }
 
  // Remove trailing newlines
  while (text_length > 0 && text_area[text_length - 1] == '\n') {
    text_length--;
  }
 
  msg->text_length = text_length;
  // Complete the send operation with the acquired memory
  result = xRingbufferSendComplete(this->handle_(), acquired_memory);
 
  if (result != pdTRUE) {
    return false;  // Failed to complete the message send
  }
 
  // Message sent successfully, increment the counter
  message_counter_.fetch_add(1, std::memory_order_relaxed);
  return true;
}
 
}  // namespace esphome::logger
 
#endif  // USE_ESPHOME_TASK_LOG_BUFFER
#endif  // USE_ESP32